The announcement came today as thousands of students across the United States walked out of their schools to protest gun violence. The protest lasted for 17 minutes, one minute for each of those killed in the Stoneman Douglas shooting on Valentine’s Day.

The Who Against Guns effort used the Twelfth Doctor’s final words of “be kind” as a rallying cry to the Doctor Who fanbase. The campaign encouraged fans to donate $10 or more to gun violence prevention charities by offering an exclusive 13-part commentary series on the 1969 Classic Who epic serial “The War Games” as an incentive.

The commentary series includes high-profile commentators such as Doctor Who show-runners Philip Hinchcliffe and Steven Moffat, along with Doctor Who television writers Paul Cornell, Jamie Mathieson, Andrew Smith, and Peter Harness.

Comic professionals also pitched in. Titan Comic artists Rachael Stott and Simon Fraser are among those commentating, as are a number of Doctor Who podcasters.

Celebrities from outside the world of Doctor Who helped to bolster the Who Against Guns effort, including Brooklyn 99 actor Stephanie Beatriz:

Guys! Some RAD Doctor Who fans are raising $$ for orgs working to end gun violence. $13,000 raised so far and the push ends TOMORROW. Let's help 'em get to $15K! Donate $10 or more to get access to bunches of EXCLUSIVE commentary and giveaways! Deets –> https://t.co/7KxPLVPnaMpic.twitter.com/8HBU3L7w4D